Refer queries to the authoritative name servers for the specific domain suffix is correct. Top level domain name servers do not hold the final host records for individual hosts and their main role is to provide delegation information that points resolvers to the authoritative name servers responsible for a given domain suffix.

TLD servers contain the NS records and any necessary glue for domains under that TLD and they return referrals to those authoritative servers when asked about names in their zone. This delegation model lets the resolver then query the authoritative server to obtain the final A or AAAA record for the hostname.

Cache DNS answers for commonly looked up hostnames is wrong because caching is normally performed by recursive resolvers and caching name servers. TLD servers are authoritative for the TLD zone and they do not serve as the global caching layer for frequently requested hostnames.

Return the resolved IP address for the requested hostname is wrong because TLD servers typically do not hold the end host A or AAAA records. Instead they provide referrals to the authoritative name servers that actually store and return the resolved IP address.

Hold and distribute the global root zone information is wrong because the global root zone is managed by the root name servers and IANA. Root servers sit above TLD servers in the DNS hierarchy and they direct queries to the appropriate TLD servers rather than functioning as those TLD servers themselves.

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